Abstract:

The aim was to illuminate ovule genesis and development of female gametophyte of Carica papaya L., find out genetic background of Carica papaya L. and supply relative information for seed production. Parafin section and hematoxylin dyeing were used in the experiment. Experiment materials were made into permanent microscopic mount whose thickness was 10-12 μm. Finally, Nikon photomicroscope was used to photograph. The results found that the ovule was anatropous, bitegminous and crassinucellate, not forming micropyle. The single archesporial originated from cuticle of the nucellus. The megaspore tetrad arranged linearly. The megaspore near chalaza was the functioning megaspore. The development of embryo sac was the polygomum type. In the 8-nucleate embryo sac, 3 karyon near chalaza formed antipodal cells ahead of other karyon. Finally the female gametophyte consisted of one oocyte and one central cell. Before the oocyte was fertilized the two pole nucleus of central cell had comulated into a secondary karyon and the other cells disappeared. The study indicated that ovule genesis and development of female gametophyte of Carica papaya L. were in accord with universal law of angiosperm. However, there was some difference from other pursuer’s study. Complex genetic background of Carica papaya L. perhaps caused distinct difference of experiment material which leaded to different results.